subdomains_in_sinatra.rb

# Match subdomain for a Sinatra route

# cz.application.local:4567 => 200 0K
# en.application.local:4567 => 404 Not Found

# In your /etc/hosts:
# 127.0.0.1 cz.application.local
# 127.0.0.1 en.application.local

require 'rubygems'
require 'sinatra'

def subdomain(host)
  condition { host == request.env['HTTP_HOST'].split('.').first }
end

get '/', :subdomain => 'cz'  do
  "You got yourself a CZ!"
end